Be patient and do it slowly. Your left foot issue may try and limit you from pushing the left hip back, but keep at it. I do a lot of half swing punch shots to get to that position and my left arm still bends a bit at impact.
I used to over hinge my wrists at the top a lot and it took me a long time to reduce the hinge, I dunno, like 6 months and I did it as mentioned above, slow swings and video. Literally try and hit a ball 10 yards with a 9 iron. And I still over hinge but because of the practice before, can fix it in a couple or even one swing. Also my MO was to hit 40 balls every other day rather than 120 balls in one or two days. I think your body needs time to take in a new movement, sleep on it.
One motivation I used to see results "instantly" was at the slow swing speed, I saw less hinge and that was the thing that encouraged me to keep going - like in the photo @iacasposted. So it'll be like 10 swings 7 over hinged, 3 less hinge. Then the next session 10 swings, 6 over hinged 4 less hinge.
The feel I used to stop hinging so much, and this is my feel, it might or might not work for you is the total opposite of retaining lag or angles, I felt like I was throwing out the angles earlier, casting almost (although not over the top). Hope this helps!
I guess the idea is to see if you can get a 500 to 1000 dollar radar based simulator which works well with the RCT golf balls. This would be a cheap alternative for home practice and a home simulator setup